Pi Sleeve Case Micro USB Support

I have used a couple different remixes of Walter's original [Raspberry Pi Sleeve case](https://www.thingiverse.com/thing:604915) (which I absolutely love, that original design is genius) to mount my Raspberry Pi (running OctoPrint) on the back of my printer's frame, so everything is nice and all together at all times, as my printer moves around the house quite a bit.

The one disadvantage of this vertical format is the Micro USB power cable tends to be a bit pulled down, simply due to gravity, putting strain on the connector, and more than once I've accidentally brushed it wrong while moving around and pulled out the cable, killing power to the Pi (and killing my print!).

So I made a simple little clip-on support for the Micro USB cable. This is made for smaller, slimmer cables, so if yours is especially chunky it may not work for you without tweaking it. But it's a fast print that doesn't use much filament, so it's worth trying! I've included the Fusion 360 file in case you wa